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Keywords: fracture toughness
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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1570
... "reservoir" zones. Subsequently, a detailed mechanical characterization was carried out on core plugs taken from each of these zones. Results show nominally "ductile" zones are weaker in terms of UCS, tensile strength, fracture toughness, and confined compressive strength. However, by a variety...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1605
... ABSTRACT: There is an long-standing debate in the rock mechanics community about the dependence of fracture toughness K Ic on the confining stress. One of the tests used to assess this dependence relies on injecting fluid into a slotted borehole drilled along the axis of a cylindrical sample...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1628
... formations were initiated under tensile loading (Mode I), progressed into a mixed tensile-shearing loading (Mode I + Mode II) at intermediate loading, and finally shearing loading (Mode II) at higher loading. The fracture toughness approximation is then presented. Only Mode-II fracture were identified...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2043
... textures. Specifically, micro-structural variations in grain sizes and bonding strengths inside each layer may introduce a higher degree of anisotropy. There is a wide range of variability of laboratory-measured fracture toughness of natural rock specimens because of micro-structural textures. However...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1645
... confining pressure, and the plastic characteristics of rocks increase with the increase of confining pressure, and the increase range of plastic characteristics of different rocks also has obvious difference. The tensile strength and fracture toughness of different rocks vary greatly, the tensile strength...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1394
... the VDR and TDR. The "jump" phenomena have been observed in the TDR caused by high fracture toughness. The displacement of fracture location and asymmetrically dynamic propagation are affected by the distribution of rock elastic modulus. These results also indicate that the hydraulic fracture propagation...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1749
... initiates. In contrast, during the 48h reaction process, the largest connected fracture network which is the collection of localized cracks is produced in sandstone. Although granite has the highest value of fracture toughness, SCDA can generate single diametrical fracture in granite. Hence, it is concluded...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1427
... NaOH solution with water/tailings ratio of 22% and cured with a slightly elevated temperature at 72±2°C, for seven days. Thereafter, the cylindrical specimens were cut into semi-circular specimens and a series of semi-circular bending tests were performed. The mode I fracture toughness, K IC...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2032
... Hmin and σ Hmax and Ph is the pore pressure: (equation) reservoir geomechanics multiplier rummel requirement upstream oil & gas stress multiplier minimum stress crack size standard revision doe reservoir characterization fracture toughness borehole extension pressure...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1747
...: linear elastic damage and initiated FPZ, fully developed FPZ, and fracture growth. The experimental results show that the full developed FPZ length of Wufeng shale is 372 μm , and the critical opening displacement is 0.671 μm . The mode I fracture toughness measured by millimeter-scale shale specimen...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0120
... with heat treatment, which are cored from the Yanjiao Town of Sanhe City in north China, are subjected to acoustic emission (AE) test under uniaxial stress and compared with HDR specimens at room temperature. The experimental results show that the value of fracture toughness at a relative high loading rate...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0332
... fracturing stages. The 3D fracability indexes can be calculated and optimized. shale gas hydraulic fracturing complex reservoir Upstream Oil & Gas fracture toughness Reservoir Characterization structural geology strength experiment formula brittleness index natural fracture evaluation...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2103
... of reduced sample size on test results is investigated by comparing it with data from standard size plugs. The potential testing suite design enables characterization of the Biot's coefficient, the fracture toughness and Brazilian tensile strength from plugs sub-cored from a sidewall core. Upstream...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1892
... model Reservoir Characterization Upstream Oil & Gas brittleness index Fracture angle reservoir characteristic brittleness fracture experiment fracability fracture toughness tight sandstone reservoir fracability evaluation evaluation rock sample fractal dimension 1. EXISTING...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0483
... ABSTRACT: Anisotropy in the mechanical properties of rock is often attributed to layering or mineral texture. Here, results from a study on mode I fracturing are presented that examine the effect of layering and mineral orientation fracture toughness and roughness. Additively manufactured...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1759
... ABSTRACT: Super-critical CO 2 (SC-CO 2 ) fracturing can be a promising technique for developing tight reservoirs. Because the propagation of artificial fractures always susceptible to the weak plane, it is necessary to study the fracture toughness of tight sandstone with a weak plane...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1742
.... hydraulic fracturing fracture toughness experiment prefabricated crack Upstream Oil & Gas Rock mechanics load-displacement curve gravel particle conglomerate meso-structure characteristic particle research unit specimen reservoir conglomerate crack propagation mechanics gravel...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1600
... to account for the leak-off of the reactive fluid. We assume that fracture toughness is a function of the cumulative leak-off volume of the reactive fluid. A sensitivity analysis permits comparing fracture propagation at various reaction rates and strengths of the reactive fluid. The numerical simulations...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-535
... ABSTRACT: Geothermal energy as an effective green renewable energy resource. Only a small fraction of HDR is currently converted to electrical power, though in the last few years many advanced technologies have been applied to its production. Great significance is given to fracture toughness...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-943
... fractures propagate due to the fracture tip stress intensity factor has exceeded the rock’s fracture toughness. However, in some circumstance, even though the tip stress intensity factor is below the rock’s fracture toughness, the fractures could continually propagate for some distance due to the water-rock...

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